Mark Zuckerberg is so rich, he could carpet his house with $100 bills and still have more money than all the readers of this post combined.

His net worth is now estimated at $18 billion, a figure that makes him the third richest tech leader in the world. On the rich guy scale, the Facebook head has quietly surpassed Steve Ballmer, Steve Jobs, Larry Page and Sergey Brin. Only Microsoft's Bill Gates and Oracle's Larry Ellison have more of the green stuff than Zuck. Not too shabby for someone who hasnt even hit thirty. [Forbes; Shutterstock/photolinc]

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